Please let your students use Open Source Software..

FOSS is not “stolen” software. Free software licenses like the GPL and the BSD and Apache licenses allow users the ability to freely use, and developers the ability to freely develop, the software placed under those licenses. Another important thing to understand about FOSS is that it is not merely “free” in the sense of “free in every box of cereal.” Making a new copy of a piece of software literally costs nothing at all—this has made it possible for community efforts to produce world-class products in a way material goods never could be.